Method of continuous casting



Oct. 21, 1958 R. EASTON 2,856,658 METHOD OF CONTINUOUS CASTING FiledAug. 13, 1956 zurus g m arr-02%)- United States Patent Ofiice PatentedOct. 21, 1958 2,856,658 METHOD OF CONTINUOUS CASTING Rufus Easton,Pittsburgh, Pa., assignor to Koppers Company, Inc., a corporation ofDelaware Application August 13, 1956, Serial No. 603,613 2 Claims. (Cl.22 200.1)

This invention relates to molten metals and more particularly to amethod of outer portion of the shell, which had been cooled down,reheats, expanding as it does so. Since there is no appreciable changein temperature in the inner portion of the shell and therefore noappreciable change in length, the expansion of the outer portion of theshell results in an inward bowing or bending of the shell away from themold wall. When this occurs, the abovementioned undesirable spill-overof the molten metal core surrounded by the solidifying shell results atthe end of the run. It then is necessary to repair the resulting damagecaused by the spill-over before casting operations can commence again.

shell about Referring to the drawing, a schematic view is disclosed of amold at the end of a casting run, which run included the practice of themethod of the present invention.

More particularly, an open-ended mold 2 is disclosed, the mold having aninner Wall 3. A plurality of spaced support and guide rollers 4 arepositioned below the mold. It is to be understood that the practice ofthe out the several steps of the invention.

A supply of molten metal has been furnished to mold 2 from a tundishnozzle (not shown) in a typical casting run and, as can be seen in thedrawing, the casting 1n the mold, broadly deslgnated by referencenumeral 6 a tendency for the solidifying shell in the mold 2 to bend tobring about undesirable molten metal spill-over, a supporting unit 9 hasbeen inserted core at the end of the run.

In the advantageous embodiment of the invention disclosed, thesupporting unit 9 is in the form of a G-shaped the bar being is possibleto use effectively refractory materials of various shapes to accomplishthe support.

It is to be noted that the supporting unit can be inserted into the moldmanually by means of a pair of gripping tongs. Further, it is to benoted that the unit should be inserted promptly at the end of the run,advantageously within 20-30 seconds after the molten metal has ceased toflow from the tundish. With the supporting unit properly inserted, themetal continues to solidify,

of the solidifying shell 7, thus avoiding any spill-over core 8surrounded by the shell. The invention claimed is:

1. A method of continuously casting molten steel comprising passing asupply of molten steel through an open-.

ended mold 111 a casting run, cooling said steel as it member into saidgradually solidifying molten metal core to maintain the solidifyingshell of the casting spread outwardly against said

1. A METHOD CONTINUOUSLY CASTING MOLTEN STEEL COMPRISING PASSING ASUPPLY OF MLTEN STEEL THROUGH AN OPENENDED MOLD IN A CASTING RUN,COOLING SAID STEEL AS IT PASSES THROUGH THE MOLD DURING THE RUN TO FORMA SOLIIDIFYING SHELL ABOUT A MOLTEN METAL CORE, AND PROMPTLY INSERTINGINTO THE MOLTEN METAL CORE AT THE END OF THE RUN A C-SHAPED SUPPORT BARTO MAINTAIN THE SOLIDIFYING SHELL OF THE CASTING AGAINST SAID MOLD TOPREVENT SPILL-OVER.